RETENTION CYST Figure 15-49 RETENTION CYST A small cyst is lined by flattened and cuboidal duct epithelium without atypia or cytoplasmic mucin. More

SIMPLE MUCINOUS CYST Figure 15-50 SIMPLE MUCINOUS CYST A haustrated cyst with a smooth inner surface and thin wall is in the head of the pancreas. More

SIMPLE MUCINOUS CYST Figure 15-51 SIMPLE MUCINOUS CYST The cyst is lined by a simple layer of columnar mucinous epithelium without papillae or cytologic atypia. More

LYMPHOEPITHELIAL CYST Figure 15-52 LYMPHOEPITHELIAL CYST Left: Opened cyst from the surface of the pancreas contains keratin debris, which is adherent to the inner surface. Right: A thin-walled, collapsed cyst in the peripancreatic tissue (arrow). More

SQUAMOID CYST IN INTRAPANCREATIC HETEROTOPIC SPLEEN Figure 15-57 SQUAMOID CYST IN INTRAPANCREATIC HETEROTOPIC SPLEEN A multilocular cyst with thin septa and a smooth lining is surrounded by red splenic parenchyma, and embedded within the pancreas. More

SQUAMOID CYST IN INTRAPANCREATIC HETEROTOPIC SPLEEN Figure 15-58 SQUAMOID CYST IN INTRAPANCREATIC HETEROTOPIC SPLEEN Left: The cyst has a fibrous wall, with splenic tissue between the wall and the cyst lining. Right: The lining epithelium consists of one to several layers of nonkeratinizing squa... More

SQUAMOID CYST Figure 15-59 SQUAMOID CYST A: Thin-walled cyst with nonkeratinizing squamous lining. B: The epithelial lining contains microcystic spaces. C: The lining resembles squamous metaplasia in the smaller pancreatic ducts. More

FOREGUT CYST Figure 15-64 FOREGUT CYST The cyst is lined by ciliated foregut epithelium and separated by fibrous stroma from pancreatic tissue. More

PARASITIC CYST Figure 15-65 PARASITIC CYST Multilocular cyst has thick white septa. (Courtesy of Dr. E. Dankoweit-Timpe, Hannover, Germany) More

RETENTION CYST Figure 15-48 RETENTION CYST Left: Multiple small and one large retention cysts adjacent to ductal adenocarcinoma. Right: A single large retention cyst with a thin lining, lacking papillae, in a predominantly normal-appearing pancreas. More

SOLID SEROUS ADENOMA Figure 4-9 SOLID SEROUS ADENOMA The neoplasm is light gray-brown. Essentially no cysts are grossly recognizable. More

MUCINOUS CYSTIC NEOPLASM Figure 5-3 MUCINOUS CYSTIC NEOPLASM Unilocular cyst with a solid mural nodule (top left), representing an area with high-grade dysplasia and associated invasive carcinoma. More

MUCINOUS CYSTIC NEOPLASM Figure 5-4 MUCINOUS CYSTIC NEOPLASM The cyst is lined by trabeculated tissue with residual glistening mucin. (Courtesy of Dr. S. Bontikous, Rothenburg, Germany) More

MUCINOUS CYSTIC NEOPLASM Figure 5-20 MUCINOUS CYSTIC NEOPLASM A: CK20 stains the epithelium of the cyst and invasive irregular glands. B: The neoplastic epithelium immunolabels for MUC5. C: Both the dysplastic epithelium and invasive carcinoma label for MUC1. More

CYSTIC PANCREATIC NEUROENDOCRINE TUMOR Figure 12-7 CYSTIC PANCREATIC NEUROENDOCRINE TUMOR CT of a central unilocular cyst present in a well-circum-scribed tumor involving the pancreatic tail. More

CYSTIC PANCREATIC NEUROENDOCRINE TUMOR Figure 12-40 CYSTIC PANCREATIC NEUROENDOCRINE TUMOR The central single cyst is lined by a layer of fibrin above a rim of neoplastic cells. More

CYSTIC SCHWANNOMA Figure 13-5 CYSTIC SCHWANNOMA Antoni A and B areas surround a cyst. More

PSEUDOCYST Figure 15-46 PSEUDOCYST The cavity is lined by inflamed fibrous tissue (left). The cyst lacks an epithelial lining and contains necrotic debris (right). More

LYMPHOEPITHELIAL CYST Figure 15-53 LYMPHOEPITHELIAL CYST Left: There is nonkeratinizing squamous epithelium overlying a dense band of lymphoid tissue. Right: Small squamous islands are within the lymphoid tissue. More

LYMPHOEPITHELIAL CYST Figure 15-54 LYMPHOEPITHELIAL CYST Anucleate squamous cells (Thinprep). More